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# File lib/rubygems/commands/install_command.rb, line 103def executeifoptions[:include_dependencies]thenalert"`gem install -y` is now default and will be removed"alert"use --ignore-dependencies to install only the gems you list"endinstalled_gems=[]ENV.delete'GEM_PATH'ifoptions[:install_dir].nil?andRUBY_VERSION>'1.9'exit_code=0get_all_gem_names.eachdo|gem_name|beginnextifoptions[:conservative]andnotGem::Dependency.new(gem_name,options[:version]).matching_specs.empty?inst=Gem::DependencyInstaller.newoptionsinst.installgem_name,options[:version]inst.installed_gems.eachdo|spec|say"Successfully installed #{spec.full_name}"endinstalled_gems.push(*inst.installed_gems)rescueGem::InstallError=>ealert_error"Error installing #{gem_name}:\n\t#{e.message}"exit_code|=1rescueGem::GemNotFoundException=>eshow_lookup_failuree.name,e.version,e.errors,options[:domain]exit_code|=2endendunlessinstalled_gems.empty?thengems=installed_gems.length==1?'gem':'gems'say"#{installed_gems.length}#{gems} installed"# NOTE: *All* of the RI documents must be generated first. For some# reason, RI docs cannot be generated after any RDoc documents are# generated.ifoptions[:generate_ri]theninstalled_gems.eachdo|gem|Gem::DocManager.new(gem,options[:rdoc_args]).generate_riendGem::DocManager.update_ri_cacheendifoptions[:generate_rdoc]theninstalled_gems.eachdo|gem|Gem::DocManager.new(gem,options[:rdoc_args]).generate_rdocendendendraiseGem::SystemExitException,exit_codeend